Raspberry Pi Forums

Is there a nice, simple beginners guide somewhere for making a Graphical C++ platformer/sandbox 2d game? Thanks.

Choosing a "game engine" or at least a "graphics engine" that you can work with is a good start. Then you can search for guides related specifically to those tools.

SDL (http://www.libsdl.org/) is probably the most widely used/known engine that has good multiplatform support and there should be plentyful of tutorials and example code out there. ( http://www.sdltutorials.com/ )

topguy wrote:Choosing a "game engine" or at least a "graphics engine" that you can work with is a good start. Then you can search for guides related specifically to those tools.

SDL (http://www.libsdl.org/) is probably the most widely used/known engine that has good multiplatform support and there should be plentyful of tutorials and example code out there. ( http://www.sdltutorials.com/ )

I tied install sdl, I don't think it worked. Is there any way to put it in a folder in the same location as the .cpp file, so i can use it as:

#include "SDL/SDL_FILE"

When you say "install" what exactly did you do ?

This is what you should have done: NOTE: there are two versions of SDL available( 1.2 and 2.0 ), if you installed libsdl2-dev instead I guess the header files is "SDL2/*.h"

topguy wrote:When you say "install" what exactly did you do ?

This is what you should have done:

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sudo apt-get install libsdl1.2-dev

NOTE: there are two versions of SDL available( 1.2 and 2.0 ), if you installed libsdl2-dev instead I guess the header files is "SDL2/*.h"

Is there some way that, instead of installing SDL, I can put it in the same folder as the .cpp file, so I can #include it like this?

#include "SDL/SDL_FILE"

mrpi64 wrote: Is there some way that, instead of installing SDL, I can put it in the same folder as the .cpp file, so I can #include it like this?
#include "SDL/SDL_FILE"

Yes, but it would be much work and totally unnecessary, and if you ever wanted to test some code written by other persons you whould have to edit their files or at least their makefiles.

You will gain nothing more than extra problems for yourself while at the same time trying to learn a language and a graphics-engine.

I think that Minecraft Pi Edition ues the SDL library...

When I try to compile a 2d platformer source for the Pi, to see if SDL works, I get this error message when I use the command 'c++ Main.cpp -o rpi-game' (the file I try to compile is called Main.cpp):



/tmp/ccT60CzQ.o: In function `app_image(SDL_Surface*, SDL_Surface*, SDL_Rect, bool)':
Main.cpp:(.text+0x380): undefined reference to `SDL_UpperBlit'
/tmp/ccT60CzQ.o: In function `app_image(SDL_Surface*, SDL_Rect, SDL_Surface*, SDL_Rect, bool)':
Main.cpp:(.text+0x48c): undefined reference to `SDL_UpperBlit'
/tmp/ccT60CzQ.o: In function `app_image(int, int, SDL_Surface*, SDL_Surface*, bool)':
Main.cpp:(.text+0x59c): undefined reference to `SDL_UpperBlit'
/tmp/ccT60CzQ.o: In function `app_image(int, int, SDL_Rect, SDL_Surface*, SDL_Surface*, bool)':
Main.cpp:(.text+0x6b0): undefined reference to `SDL_UpperBlit'
/tmp/ccT60CzQ.o: In function `load_image(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int, int, int)':
Main.cpp:(.text+0x700): undefined reference to `IMG_Load'
Main.cpp:(.text+0x71c): undefined reference to `SDL_DisplayFormat'
Main.cpp:(.text+0x778): undefined reference to `SDL_MapRGB'
Main.cpp:(.text+0x790): undefined reference to `SDL_SetColorKey'
Main.cpp:(.text+0x798): undefined reference to `SDL_FreeSurface'
/tmp/ccT60CzQ.o: In function `load_image(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int, int, int, int)':
Main.cpp:(.text+0x7e8): undefined reference to `IMG_Load'
Main.cpp:(.text+0x804): undefined reference to `SDL_DisplayFormat'
Main.cpp:(.text+0x83c): undefined reference to `SDL_MapRGB'
Main.cpp:(.text+0x854): undefined reference to `SDL_SetColorKey'
Main.cpp:(.text+0x86c): undefined reference to `SDL_SetAlpha'
Main.cpp:(.text+0x874): undefined reference to `SDL_FreeSurface'
/tmp/ccT60CzQ.o: In function `startup()':
Main.cpp:(.text+0x894): undefined reference to `SDL_Init'
Main.cpp:(.text+0x8cc): undefined reference to `SDL_SetVideoMode'
Main.cpp:(.text+0x90c): undefined reference to `SDL_WM_SetCaption'
/tmp/ccT60CzQ.o: In function `Timer::start()':
Main.cpp:(.text+0x3044): undefined reference to `SDL_GetTicks'
/tmp/ccT60CzQ.o: In function `Timer::pause()':
Main.cpp:(.text+0x30dc): undefined reference to `SDL_GetTicks'
/tmp/ccT60CzQ.o: In function `Timer::unpause()':
Main.cpp:(.text+0x3134): undefined reference to `SDL_GetTicks'
/tmp/ccT60CzQ.o: In function `Timer::get_ticks()':
Main.cpp:(.text+0x31a8): undefined reference to `SDL_GetTicks'
/tmp/ccT60CzQ.o: In function `main':
Main.cpp:(.text+0x4770): undefined reference to `SDL_PollEvent'
Main.cpp:(.text+0x5c68): undefined reference to `SDL_PollEvent'
Main.cpp:(.text+0x5ce4): undefined reference to `SDL_Flip'
Main.cpp:(.text+0x5d4c): undefined reference to `SDL_Delay'
Main.cpp:(.text+0x5d68): undefined reference to `SDL_Quit'
/tmp/ccT60CzQ.o: In function `img::~img()':
Main.cpp:(.text._ZN3imgD2Ev[_ZN3imgD5Ev]+0x4c): undefined reference to `SDL_FreeSurface'
/tmp/ccT60CzQ.o: In function `animate::End_This()':
Main.cpp:(.text._ZN7animate8End_ThisEv[animate::End_This()]+0x40): undefined reference to `SDL_FreeSurface'
collect2: ld returned 1 exit status

You're getting that error because you've not setup the appropriate include or linker flags - I suggest you check the SDL / compiler documentation.

And maybe have a look at http://wiki.libsdl.org/SDL1.2Tutorials in general, and http://www.wildbunny.co.uk/blog/2011/12 ... me-part-1/

How do I set them up?

mrpi64 wrote:When I try to compile a 2d platformer source for the Pi, to see if SDL works, I get this error message when I use the command 'c++ Main.cpp -o rpi-game' (the file I try to compile is called Main.cpp):

Did you download this code from somewhere ? Where ? Did it come with a Makefile or similar its these things that set up the compiler parameters correctly. Did it come with some compiling/installing instructions ?

I followed the instructions on the README file that I got when I downloaded the source code from the SDL website.

I find it strange if any official example didnt include instructions on how to link with the library.
.. should work according to this: http://lazyfoo.net/SDL_tutorials/lesson ... /index.php

topguy wrote:I find it strange if any official example didnt include instructions on how to link with the library.

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c++ Main.cpp -o rpi-game -lSDL

.. should work according to this: http://lazyfoo.net/SDL_tutorials/lesson ... /index.php

Thanks. I guess that if I could import the thing directly from usr/include/sdl